使用StoryBoard执行动画

　　在WPF动画编程中，最常用的动画处理方式是DoubleAnimation动画，但是随着你的开发经验越来越多，你会发现，有时候使用这个动画类会很麻烦，因为这个动画是封闭动画，也就是说在动画的时间间隔内，你不能对它做对应依赖属性的赋值操作，这让你很多时候止步于很好的想法。

　　因为我们要求某个时刻动画能停止，属性能赋值新的值。所以WPF中提供StoryBoard，这个和IOS中StoryBoard概念有点像，故事版嘛，就是一大堆事情放在同一块进行统一处理，例如你对某个对象坐了多个属性的动画，这些动画就可以用一个StoryBoard统一管理，极其方便。下面博主写了一个StoryBoard的动画，描述一个矩形位置移动，相信在你以后的开发当中会经常用到。

 public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            Loaded += new RoutedEventHandler(Window1_Loaded);
        }
        Storyboard _sb = new Storyboard();
        Rectangle rect1 = new Rectangle();

        void Window1_Loaded(object sender, RoutedEventArgs e)
        {
            DoubleAnimation da = new DoubleAnimation()
            {
                From = 0,
                To = 300,
                FillBehavior = FillBehavior.Stop,
                //AutoReverse = true,
                //RepeatBehavior = RepeatBehavior.Forever,
                Duration = TimeSpan.FromSeconds(2)
            };
            DoubleAnimation da1 = new DoubleAnimation()
            {
                From = 0,
                FillBehavior = FillBehavior.Stop,
                To = 300,
                //RepeatBehavior = RepeatBehavior.Forever,
                Duration = TimeSpan.FromSeconds(2)
            };
            Rectangle rect = new Rectangle();

            rect.Width = rect.Height = 100;
            rect.Fill = Brushes.Blue;
            _canvas.Children.Add(rect);

            rect1.Width = rect1.Height = 100;
            rect1.Fill = Brushes.Red;
            _canvas.Children.Add(rect1);

            _sb.Children.Add(da);
            Storyboard.SetTarget(da, rect);
            Storyboard.SetTargetProperty(da, new PropertyPath(Canvas.LeftProperty));
            _sb.Begin();
        }
        /// <summary>
        /// 开始动画
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            bsCopy = _sb.Clone();
            bsCopy.Children.Clear();
            foreach (var item in _sb.Children)
            {

                bsCopy.Children.Add(item);
                Storyboard.SetTarget(item, rect1);
                Storyboard.SetTargetProperty(item, Storyboard.GetTargetProperty(item));
            }
            bsCopy.FillBehavior = FillBehavior.Stop;
            bsCopy.Completed += delegate
            {
                int a = 3;
                Canvas.SetLeft(rect1, 100);
            };
            bsCopy.Begin();
        }
        /// <summary>
        /// 停止动画
        /// </summary>
        Storyboard bsCopy;
        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            bsCopy.Stop();
            Canvas.SetLeft(rect1, 100);
        }
    }